Sparks fly when Halstead and Upton are thrown back together during a citywide emergency that pulls all of Chicago to the brink. The high-stakes crossover doesn’t just test the city—it reignites unfinished business between two people who know each other better than anyone else. The tension is personal, the danger is real, and nothing stays buried for long. Watch the One Chicago Crossover Event Wednesday, March 4 starting at 8/7c on NBC and stream next day on Peacock.
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